A nail almost never goes in straight. It gets flicked up by the tyre in front, lands at an angle and is driven in on the slant, so the entry point in the tread and the hole in the inner liner can be a good distance apart. That is why a repair cannot be judged from the outside. You can look at the head sitting nicely in the middle of the tread, take the tyre off and find the exit inside is well over into the shoulder, where no repair is permitted at all.
So the honest answer on the phone is that it looks promising rather than that it is definitely fine, and the real answer arrives once the bead is broken and the inside can be seen. If the exit is in the repairable band, the channel is reamed along its actual line, a combined plug and patch goes in from the inside to BS AU 159, and the wheel is rebalanced. If it has travelled into the shoulder, you get told why and a replacement goes on from the van. That conversation happens at whatever hour the tyre chose, on a drive in Pinner Green or in a lay-by off the A410 Uxbridge Road.
Nobody wants to be stood over a wheel at four in the morning on Rayners Lane, and with us you are not. You ring, we come out, and the wheel comes off while you sit in the warm, on a driveway in Pinner Village or wherever the car ended up. Level in Hatch End, sloping in Eastcote: we set the car straight first. Underground parking in Rayners Lane or North Harrow is worth flagging.

24-hour tyre repair in Pinner is part of our wider puncture repair across London and the home counties cover. For 24-hour tyre repair in Pinner, call 07717 389637 or ask us for a quote.
Plenty of the punctures picked up around Pinner come off the narrower lanes rather than the main roads, and debris that has been flicked up rarely goes in tidily. That is the reason the tyre comes off the rim before anybody promises anything. Whatever the verdict, it is reached where the car is standing and at whatever hour it happens to be.
A nail in a car near Eastcote looked ideally placed from the tread. Inside, it had travelled well out towards the shoulder, and the tyre could not be saved.
A screw in a tyre off the B466 Pinner Hill Road had gone in on the slant and still finished within the repairable band. Reamed along its line and patched properly.
A puncture found at eleven in Pinner Village. The tyre came off there, the exit was checked from inside, and the repair was done before midnight.
Only roughly. Nails go in at an angle, so where the head sits is not always where the hole comes out. The definite answer comes with the tyre off the rim.
Because the repair has to seal the inner liner, and that patch has to sit in the central band. If the exit is in the shoulder there is nowhere safe to put it.
No. Leave it in until the fitter is with you. It is doing no harm and it makes the entry easier to find.
Every night. Pinner Village, Pinner Green, Rayners Lane and the roads towards Harrow are all covered around the clock.
Yes, when it is done to BS AU 159 with the tyre off the rim. It lasts the remaining life of the tyre rather than getting you home.
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